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altera_tse: Correct rx packet length

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Altera TSE MAC rx DMA transfer starts with the 2 additional bytes for IP
payload alignment. This patch fixes tse_rx() function loop which reads DMA
rx status and extracts packet length from it. Status signalises a whole DMA
transfer length, which is 2 bytes longer than the packet itself.

Signed-off-by: Vlastimil Setka <setka@vsis.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlastimil Setka 2015-04-29 00:17:11 +02:00 committed by David S. Miller
parent 42eab005a5
commit 48734994ac
1 changed files with 6 additions and 0 deletions
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6
drivers/net/ethernet/altera/altera_tse_main.c
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@ -391,6 +391,12 @@ static int tse_rx(struct altera_tse_private *priv, int limit)
"RCV pktstatus %08X pktlength %08X\n",
pktstatus, pktlength);
/* DMA trasfer from TSE starts with 2 aditional bytes for
* IP payload alignment. Status returned by get_rx_status()
* contains DMA transfer length. Packet is 2 bytes shorter.
*/
pktlength -= 2;
count++;
next_entry = (++priv->rx_cons) % priv->rx_ring_size;